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take slice of cmd/utils from upstream (ava-labs#1082)
* take slice of cmd/utils from upstream * add header
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| // Copyright 2015 The go-ethereum Authors | ||
| // This file is part of go-ethereum. | ||
| // | ||
| // go-ethereum is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU General Public License as published by | ||
| // the Free Software Foundation, either version 3 of the License, or | ||
| // (at your option) any later version. | ||
| // | ||
| // go-ethereum is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License | ||
| // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| // Package utils contains internal helper functions for go-ethereum commands. | ||
| package utils | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "runtime" | ||
| "strings" | ||
|
|
||
| "github.com/urfave/cli/v2" | ||
| ) | ||
|
|
||
| // Fatalf formats a message to standard error and exits the program. | ||
| // The message is also printed to standard output if standard error | ||
| // is redirected to a different file. | ||
| func Fatalf(format string, args ...interface{}) { | ||
| w := io.MultiWriter(os.Stdout, os.Stderr) | ||
| if runtime.GOOS == "windows" { | ||
| // The SameFile check below doesn't work on Windows. | ||
| // stdout is unlikely to get redirected though, so just print there. | ||
| w = os.Stdout | ||
| } else { | ||
| outf, _ := os.Stdout.Stat() | ||
| errf, _ := os.Stderr.Stat() | ||
| if outf != nil && errf != nil && os.SameFile(outf, errf) { | ||
| w = os.Stderr | ||
| } | ||
| } | ||
| fmt.Fprintf(w, "Fatal: "+format+"\n", args...) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| // CheckExclusive verifies that only a single instance of the provided flags was | ||
| // set by the user. Each flag might optionally be followed by a string type to | ||
| // specialize it further. | ||
| func CheckExclusive(ctx *cli.Context, args ...interface{}) { | ||
| set := make([]string, 0, 1) | ||
| for i := 0; i < len(args); i++ { | ||
| // Make sure the next argument is a flag and skip if not set | ||
| flag, ok := args[i].(cli.Flag) | ||
| if !ok { | ||
| panic(fmt.Sprintf("invalid argument, not cli.Flag type: %T", args[i])) | ||
| } | ||
| // Check if next arg extends current and expand its name if so | ||
| name := flag.Names()[0] | ||
|
|
||
| if i+1 < len(args) { | ||
| switch option := args[i+1].(type) { | ||
| case string: | ||
| // Extended flag check, make sure value set doesn't conflict with passed in option | ||
| if ctx.String(flag.Names()[0]) == option { | ||
| name += "=" + option | ||
| set = append(set, "--"+name) | ||
| } | ||
| // shift arguments and continue | ||
| i++ | ||
| continue | ||
|
|
||
| case cli.Flag: | ||
| default: | ||
| panic(fmt.Sprintf("invalid argument, not cli.Flag or string extension: %T", args[i+1])) | ||
| } | ||
| } | ||
| // Mark the flag if it's set | ||
| if ctx.IsSet(flag.Names()[0]) { | ||
| set = append(set, "--"+name) | ||
| } | ||
| } | ||
| if len(set) > 1 { | ||
| Fatalf("Flags %v can't be used at the same time", strings.Join(set, ", ")) | ||
| } | ||
| } |
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